CVE-2021-28809

moderate-risk
Published 2021-07-08

An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3. If exploited, this vulnerability allows attackers to compromise the security of the operating system.QNAP have already fixed this vulnerability in the following versions of HBS 3: QTS 4.3.6: HBS 3 v3.0.210507 and later QTS 4.3.4: HBS 3 v3.0.210506 and later QTS 4.3.3: HBS 3 v3.0.210506 and later

Do I need to act?

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0.58% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Qnap

References (4)

Vendor Advisory https://www.qnap.com/en/security-advisory/qsa-21-19
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-783/
Vendor Advisory https://www.qnap.com/en/security-advisory/qsa-21-19
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-783/
39
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 2/34 · Minimal
Exposure 5/34 · Minimal